The tricuspid valve shuts. This prevents blood from flowing backward into the right atrium while the ventricle contracts. So, your answer will be the Tricuslid Valve. Hope I helped!
Answer:
The idea of natural selection is that traits that can be passed down allow organisms to adapt to the environment better than other organisms of the same species. This enables better survival and reproduction compared with other members of the species, leading to evolution.
Amoeba is a unicellular heterotrophs.It has no mouth but engulf food particles by spreading two of its pseudopodia and the food find its way into the food vacoule.The digested food is absorbed by the protoplasm by diffusion.
Answer:B
Explanation:Pest controI and the uses of pesticides are not good.This makes the meat unhealthy and not nutritious the but in sustainable farming there are no use of pesticide and other dangerous substances which makes the meat healthy and nutritious.